藤梨根和益气补肾口服液的体内抗肿瘤作用比较

目的:观察藤梨根和益气补肾口服液对S180实体瘤的抑制作用,并进行病理学观察。方法:用小鼠S180模型,观察藤梨根和益气补肾口服液对肿瘤的抑制作用,计算抑瘤率,并做病理学检查。结果:藤梨根和益气补肾口服液高、中、低剂量组与模型组比较,对S180实体瘤均有一定的抑制作用,但益气补肾口服液抑瘤率较藤梨根高。结论:藤梨根有一定的抑制S180生长的作用,其抑瘤作用不如益气补肾口服液

ERCP对梗阻性黄疸病因的诊断价值

目的:探讨ERCP对梗阻性黄疸病因的诊断价值. 方法:对74例梗阻性黄疸行ERCP检查并与术后诊断比较,其中41例同时有ERCP,B超及CT检查,比较三者诊断的符合率. 结果:本组示恶性胆道梗阻36例,占48.6%;良性梗阻38 例,占51.4%.与术后诊断比较,ERCP对胆总管结石的诊断符合率96.9%.对恶肿瘤诊断符合率77.8%,主要是胰腺癌、胆管癌、胆囊癌及壶腹周围癌等.41例中ERCP对梗阻性黄疸病因的诊断率明显高于B超及CT(P<0.05). 结论:ERCP对梗阻性黄疸具有较高的诊断价值,优于B超和CT

Summer fluxes of atmospheric greenhouse gases from mangrove soils in Jiulongjiang Estuary

红树林湿地土壤是一个潜在的温室气体排放源.调查了夏季福建九龙江口的秋茄(kAndElIA CAndEl)红树林湿地土壤-大气界面3种温室气体的通量并分析土壤环境对其的影响.研究结果显示,九龙江口红树林夏季3种温室气体n2O、CH4和CO2的通量分别是0.27~2.45、-0.28~341.43μMOl/(M2·H)和-0.49~17.00 MMOl/(M2·H),表明九龙江口夏季红树林土壤总体上是温室气体的排放源.根据3种温室气体的平均通量及其增温潜力计算它们的CO2当量通量以反映3种温室气体产生的增温效应,计算结果显示九龙江口红树林夏季土壤排放温室气体的CO2当量通量为82.33~674.92 Mg/(M2·H),而CO2是最大的贡献因素.双因素方差分析结果表明,CO2通量和土壤理化性质因林地和滩面而异,CH4通量受林地的影响,但n2O通量则不受林地和滩面的影响.相关性分析结果显示,土壤环境因子是影响红树林温室气体通量空间差异的重要原因,其中土壤有机质、氨态氮和总氮含量是影响n2O和CO2通量的主要因子,而CH4则只与土壤氧化还原电位显著相关.Mangrove swamps are considered to be a potential net source of greenhouse gases,but the fluxes of greenhouse gases from mangrove soils are still poorly characterized.The present study,conducted in July 2012 in 3 Kandelia candel mangrove forests in Jiulongjiang Estuary in southern China,aimed to investigate the summer fluxes of N2O,CH4and CO2from the soil and the role of soil characteristics in regulating gas fluxes.Gas fluxes ranged from 0.27 to 2.45 μmol /( m2· h),-0.28 to 341.43 μmol/( m2· h) and-0.49 to 17.00 mmol/( m2· h) for N2O,CH4and CO2,respectively,indicating that mangrove soil was an emission source of greenhouse gases in Jiulongjiang Estuary in summer.Total CO2-equivalent fluxes of the three gases,indicating their global warming potential,ranged from 82.33 to 674.92 mg /( m2· h),and CO2was the most dominant in the total flux in the mangroves.This study recorded higher CO2at the landward site than middle zone and seaward site,while there were no differences in both N2O and CH4fluxes among different tidal positions.Soil characteristics also varied with mangrove transect or sampling position.These characteristics,especially nutrient contents were factors regulating greenhouse gases emissions and their spatial variations in mangrove.N2O and CO2fluxes were positively related to soil organic matter,ammonium and total nitrogen concentrations,and CH4flux showed significant and negative correlation with the redox potential(Eh).国家自然科学基金资助项目(41206108;41076049); 福建省自然科学基金资助项目(2011J05111); 科技部海洋公益性行业科研专项资助项目(201205008); 人社部留学人员科技活动项目择优资助经费资助项

EXPERIMENTAL STUDY OF FUEL CELLS PERFORMANCE IN SHORT TERM MICROGRAVITY CONDITION

开展了不同重力情况下燃料电池性能的实验研究.利用微重力落塔,对常重力和微重力条件下燃料电池发电时其内部的两相流动开展了可视化现场观测.对重力因素对燃料电池内部传质过程的影响进行了分析和讨论.实验结果表明:当电流密度较大时,在微重力环境中燃料电池性能较常重力环境中的有较明显下降.由于微重力条件下浮升力的消失导致气体不能及时从流道中排出,进而对直接甲醇燃料电池内的传质过程产生负面影响

短时微重力条件下燃料电池性能实验研究

开展了不同重力情况下燃料电池性能的实验研究。利用微重力落塔，对常重力和微重力条件下燃料电池发电时其内部的两相流动开展了可视化现场观测。对重力因素对燃料电池内部传质过程的影响进行了分析和讨论。实验结果表明：当电流密度较大时，在微重力环境中燃料电池性能较常重力环境中的有较明显下降。由于微重力条件下浮升力的消失导致气体不能及时从流道中排出，进而对直接甲醇燃料电池内的传质过程产生负面影响

Duct Segmentation Method Based on Seed Region Growing Algorithm

目的:对CT片中的胆管进行分割。方法:采用图像分割技术中的种子区域增长法,首先,选取种子点,得到种子点所对应CT值和相邻26个点均值,然后以种子点所在位置为起点往其临近26点扩散。若其临近点CT值与种子点CT值差值在正负10个Hu或者均值满足相同要求则该点为同类点,依次类推,直到不再有同类点时算法结束。结果:自动分割的准确率>80%,计算误差 80%,computation error < 10%.Condusions:seed region growing method can be used to automatically segment bile duct in the film CT.国家自然科学基金项目资助(编号:61271336;61327001)~

Experimental Study on Two-Phase Flow and Power Performance of DMFC Utilizing the Drop Tower Beijing

利用国家微重力实验室落塔提供的短时微重力实验环境，对常重力和微重力条件下直接甲醇燃料电池（DMFC）内部的气液两相流动形态和相应电性能等的影响进行了实验研究，发现在微重力条件下，DMFC阳极流道内CO_2气泡速度很小，气泡尺寸随着时间的推移而不断长大，甚至堵塞流道；流道堵塞现象随电流增大而急剧强化．电性能曲线显示，在浓差极化区存在显著的重力效应，电性能的恶化随浓差极化程度的加强而增大

初步的IMP重离子治疗计划系统；A Preliminary Version of Heavy Ion Treatment Planning System at IMP

中国科学院近代物理研究所基于兰州重离子研究装置(HIRFL/HIRFL-CSR),在被动型束流配送系统下采用二维分层适形照射治疗技术开展重离子治癌临床试验研究。为了更好地利用重离子束在肿瘤放射治疗中的生物物理优势并保障重离子临床治疗试验的顺利实施,一个初级版本的重离子治疗计划系统已经设计完成。此计划系统是针对被动型束流配送系统下的二维分层适形照射治疗方式来进行设计的。介绍了此系统的设计框架、可提供的功能以及利用宽束算法进行剂量计算在此系统中的实现。通过人体仿真体模实验证实由该治疗计划系统给出的靶区计划剂量与实测剂量的偏差在5%之内。最后讨论了设计较为完备的重离子治疗计划系统仍需解决的问题

Construction of Tissue Engineered Dermal Substitutes and Its Effect on Wounds Repairing

[中文文摘]以双层胶原-壳聚糖海绵为支架构建组织工程真皮替代物并研究其在大鼠创伤愈合中的作用.将双层胶原-壳聚糖海绵支架埋植于SD大鼠皮下以考察其组织相容性;将SD大鼠皮肤中分离的成纤维细胞种植在支架上体外构建人工真皮替代物,并将该替代物移植到SD大鼠皮肤缺损处以修复创面.皮下埋植实验显示支架植入早期有炎症反应,但一周后炎症反应逐渐减轻,而且有成纤维细胞和毛细血管的侵入.皮肤移植实验结果显示:术后第7天和第14天实验组创面表皮再生和肉芽组织增生比对照组更快更明显;第14天和第21天实验组创面面积明显小于对照组(p<0.05).因此以双层胶原-壳聚糖海绵为支架构建的组织工程真皮替代物具有良好的生物相容性,并能促进皮肤创面的愈合,可以作为人工真皮替代物用于皮肤缺损的修复。[英文文摘]A tissue engineered dermal substitute is developed to provide skin wounds healing of rats.The skin graft replacement has been designed as a dermal substitute comprising dermal fibroblast cells isolated from rat skin.The dermal substitute is constructed by a bilayer collagen-chitosan sponge scaffold,into which rat fibroblasts are seeded.Its tissue compatibility was studied by transplantation test on full-thickness wounds of SD rats.Subcutaneous implantation test shows early inflammatory response,which alleviated gradually af ter one week. The fibroblasts and capillary vessels grow into the porous sponge scaffold. Histological observations indicate that epidermis regeneration and acestoma hyperplasia of the experimental group are more obvious than that of the cont rol group on the 7th day and 14th day af ter t ransplantation. The healing rate of the experimental group is significantly higher than that of the cont rol group ( p < 0. 05) on the 14th day and 21st day. These experiment s provide evidence that the tissue engineered dermal substitute has good biocompatibility and promotes wounds healing. It could be a potential artificial dermal substitute to repair the skin defect.福建省科技计划项目(2003Y006)资